There's no collective term for a group of echidnas.
they probably do but it might sound really soft that you can't even hear it to call other echidnas.
They don't. A "porky" is a lie. If someone has told you that Australians call echidnas porkies, they are telling you a porky. Some people may call them porkies for two reasons - porkie is short for porcupine and, even though echidnas are not related to porcupines, they have sharp spines like porcupines do. Also, the word porcupine rhymes with spine (the sharp quills on an echidna) and Australians are fond of rhyming slang.
Echidnas do not hibernate.
No. Echidnas do not hop. They walk.
There are no echidnas in Bali. Echidnas are found only in Australia and on the island of New Guinea.
No. All echidnas are mammals, and all mammals are vertebrates. Echidnas are different from "echinoderms".
No. Echidnas eat termites.
If you mean genus, e.g. Canines, Felines, etc., then platapusses and echidnas are marsupials
Yes. Echidnas are solitary animals.
Echidnas do not hibernate.
Echidnas do not hibernate.
No. Echidnas are not hostile to people or other animals.